Pulley



(No Model.)

J P. SERVE.

GROOVED- PULLEY.

Patented Jan. 5, 1897.-

I \xf geaaea JEAN PIERRE SERVE OF LYONS, FRANCE.

GROOVED PU LLEY.

SPECIFICATION forming part of Letters Patent N 0. 574,580, dated January 5, 1897.

Application filed October 9,1895. Serial No. 565,148. (No

T0 or whom it may concern.-

Be it known that I, JEAN PIERRE SERVE, engineer, a citizen of the Republic of France, residing at 17 Quai de Ouire, Lyons, in the Republic of France, have invented certain new and useful Improvements in Grooved Pulleys for Transmitting Power by Cables or for other like Purposes, (patented in France March 15, 1892, No. 220,144,) of which the following is a specification.

This invention relates to improvements in grooved pulleys for'eable or other like transmission of power.

It has for its object to afford eflicacious means for preventing the cable from slipping in the groove of the pulley under the strain of the traction to which it is subjected, and thus to avoid loss of power and wear and tear model.) Patented in France March 15, 1892, No. 220,144.

prevent it slipping under the action of the traction to which it is subjected.

In order that the cable coming in a straight line maynot escape and that it maybe obliged to bend laterally and penetrate completely into the undulations of the groove a, I take care to make this latter of sufficient depth and to round the edges, so as to form thus a sort of external circular groove in which the cable first engages and is guided, in order to afterward descend into the und ulations which it has to pass around, and the inclined and equidistant faces of which are suitably adjusted to their circular prolongation. This arrangement is clearly shown in Fig. 2, in which d cl are the two circular parts of the grooves and a: 00 and y y represent the two oblique faces of the undulated part in which of the cable resulting from its slipping and from the stretching due to the excess of tension found necessary at present to prevent it from slipping.

The invention consists, essentially,in giving the pulley groove or grooves an undulated form and in arranging the interior faces of the cable lodges. Finally, the dotted parallel lines indicate the extreme positions of these two faces 00 :r, 'g 3 which, according as they are more or less distant from the mean plane X X of the pulley, fit at different heights to the circular edges cl (Z of the grooves.

In order to make these pulleys having one the groove in a special manner. These undulations may be more or less pronounced, according to the nature of the power to be transmitted. In this manner the cable is forced to bend alternately on two sides of its mean position, thus exerting against the projections and the undulations of the groove transverse strains,which insure its adherence and oppose any deleterious slipping.

The invention is shown in ing drawings, in which- Figure 1 is a front elevation of a pulley with a single undulated groove. Fig. 2 is a transverse section, on a largerscale, of Fig. 1, showing the form of the groove.

As may be seen in Fig. 1, the periphery or rim A of the pulley is provided with a deep groove a, the walls of which are slightly inclined, with the object of more strongly gripping the cable 6 and presenting alternately at each side of the central plane X X more the accompanyor less numerous and more or less pronounced projections, which form a series of undulations which the cable is forced to follow when passed round the pulley, the effect of which or more undulated grooves, I employ revolvand which receives a given transverse movement by means of a templet. I can also form the pulleys of several similar parts provided laterally with projections and symmetrical hollows in parts opposite one another, so that the projections of the one coincide with'the hollows of the other, an undulated pulley, such as the one shown in Fig. 1, is obtained, the connecting-face of the two parts being again represented by the mean line X X of this figure. Any other suitable means may, however, be employed, such, for instance, as by applying to each side of the circular groove of a pulley packing of suitable form attached thereto by means of screws or in other suitable manner.

Finally, the undulated grooved pulleys which I have just described may, of course, not only be employed for transmitting movement by cables, but may also be employed with advantage in certain machines for operating tools or the like employed in industry.

It will be obvious that while I have shown is to hold the cable firmly in the groove aand and described my improved pulley as proing chisels acting on the cast-metal pulley,

such a way that by fixing these.

ICU

vided with but one groove 1 may, without de- 1 ation of the inncrgroove andharing side walls parting from the limits or spirit of my inven- 1 extending straight around the pulley and par- I 5 tion, provide the same with a plurality of l allcl to each other and diverging from the grooves of a form and arrangement exactly point where they join the walls of the inner 5 similar to that described above in detail, the 5 groove, outward.

number of grooves with which I provide a In testimony whereof I have signed my pulley depending upon the amount of power name to this specification in the presence of 20 which it is desired to have the same transmit. i two subscribing witnesses.

I declare that what I claim is T d .u-i t ESE *1. IO lhe lmproved pulley provided in its periph- I] A\ PIPER] I 1 I eral face with an inner groove having e0n 5 \Vitnesses: tinuous undulating side walls diverging out- JOSEPH MAUR DUHOULIN MINGUEL,

ward and an outer groove forming a eontinu- PIERRE ROUMIER. 

